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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb160f87f83079bd5417a912385920a73ba2eafc4d91e0521ad3c43ffafa1b9' 
  AND token = 'MfwzZm8poOw/3G6wspf2Uzpo5osrrkoR6UYU2Kn90r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}